Power supply and charger circuit



Jan. 23, 1951 J. R. GELZER 2,539,015

F/L AMENT Ell g go- T 26 26 T T O 223 POWER SUPPLY AND CHARGER CIRCUIT Filed Jan. 8, 1947 F/LAME/VT COMMON V/BRA Tax? 0/? DYNA MOTOR FI5 I- COMMON V/BRA TOR 0/? DYNAMOTOR FIE-r- H-- JUHN 1;- [35112551 Patented. Jan. 23, 1 951 UNITED STATES v Pow...

John R. Gelzer, Jackson, Mich; assignor to Eltron, Inc., a corporation of Michigan,

Application January 8, 1947, serisrNwjmo s1?- 5 Claims-:1 (01171-1971- This invention relates to electrical power supply systems, and speicifically' to improvements which provide filtering to reduce noise levels, current fluctuation dampening, and reactivation of primary power sources. In operating radio, electrical or electronic equipment from primary batteries, it is frequently necessary to supply primary power, both to a filament circuit and to a dynamotor or vibrator device which will amplify the primary voltage to a higher voltage level. The vibrator. ordynamotor used in this way will usually impose A. C. fluctuations on the primary batteries due to the intermittent nature of the current drawn. This A. C. fluctuation will produce interference noises in the filament circuit to such an extent that it is necessary to provide filtering between the terminals supplying primary power to the dynamotor or vibrator and the terminals supplying filament power.

An object of this invention is to provide a power supply and charger circuit which will supply a well stabilized and filtered direct voltage for the operation of sensitive electrical equipment;

A further object is to provide a power supply and charger circuit which will allow the use of a charging current derived from a transformer and rectifier, or any other source of charging current, to reactivate, recharge or to furnish supplementary current to the primary batteries without transmitting current fluctuations to the point or terminal supplying filament power.

A still further object is to provide a power supply and charger circuit which will assure that both primary output voltages will be regulated and free of any voltage fluctuations which might result from operation of the charging system alone without the stabilizing influence of the primary batteries.

In the drawings,

Fig. I shows an example of a circuit embodying the invention showing the use of two batteries as filter elements, and

Fig. II shows an example of a circuit embodying the invention utilizing a single battery and separate filter condensers.

Referring to the drawings, a transformer 10 is supplied with power from a domestic or outside power source l2. The output of the transformer I0 is rectified by a selenium or copper oxide rectifier M before the said output enters primary battery 16, so that pulses of direct current are supplied to primary battery is and battery l8.

Primary power for a vibrator or dynamotor 22 is taken'from battery l6. An impedance 20, which may be an inductance, s-shown, or a resistance, is connectedrbetweenbattery l6 and battery l8, to-prevent the tra -s ssjionof A. G fluctuations from battery 45 battery IS. in this respect the impedance Z and batteries iii and it are used as elementsof, agfi lter networ-ln. The filament 24 is thenesupplied ith filament power frombattery Through rtheruseofthis ircuit, -Lfluctuations in the -voltage;;-'of. battery' l6, which result from the inter itten nat'redfjeither the charging current-sup-plied-ny he 1 .";i'.='Q1 anders, ternal vibrator or dynain by the series impedanceifl and the regulation resistance of battery [8, These fluctuations will not, then, be transmitted to the external filament circuit.

The output volta fis delivered by the power supply and charger circuit'will depend largely on the voltage condition of battery l6 and battery l8, and will therefore be partly independent of line voltage fluctuations occurring on, the primary of the transformer l0 or of fluctuations occurring in any other charging device. The power supply will deliver output voltages even when the transformer I0 is not energized from outside power sources, and in the absence of any other charging means. In such a case, all of the external power is supplied by battery It and battery l8. There is a distinct advantage in portable equipment utilizing a power supply of this type, for the batteries I6 and i8 may be made much smaller, lighter, and cheaper, while main-' side source l2, the output of transformer it being-rectified by a selenium or copper oxide rectifier before this output enters battery 39. Hooked into the circuit following battery 35 is a filter condenser 26, following which the power is taken off for the vibrator or dynamotor 22'. The impedance 29', which again may be an inductance or a resistance, is connected between filter condenser 26 and a following filter condenser; 28 in the circuit which provides filtered power to the filament 24'. In this application, battery IB and battery l8 of Fig. I have been replaced by filter condensers 26 and 28 which perform; the same filter function. The sin le battery 39 }furnishes-the sterilizing action necessary in this"circuit; i

I have likewise found th h variation shown in Fig. II may be even flirt simplified by the elimination offilter condenser 26 when battery 30 is to be used both for stabilizing purposes and as afilter element. In this-arrangement, battery 3'0' 'wil1 filter enough of the line voltage fluctuations-so that flltenrcondenser-zfl. isryable to filter the-remainder, giving results-which are substantially equal to those obtained when filter.

condenser 25 is used.

Having thus described nay-invention; what: I;

claim as new and desire to ccverby Letters Patent is:

1. A power supply comprisingm'ean's adapted to beenergized from an unflltezed'ipower. supply;,, an electrical energy 'storagedevice, a-circuitfor.

connecting said meansacross. said device-where by said device may receive energy from such supply; a filteringnetworkrccmprising an imped anceelement having-r arpaii ofi'tennina-ls; and a second electric- (energy storage device havi-ng a pair of terminals, one or each-1 of sa-i'd pair' of terminals being"connectedetogetherand adapted to supply one-conductor offa: loadcircuit a sec ondof said-'impedance -dement' terminals being connected to said first named" device;- circuit means connecting the other of said second? device" terminals: with: said first-named? device; and a second loadfcircuiticunnectedrizrzunfiltered relationship to'said't'imped'ahcaPd cesecondtenminal whereby" voltage MlSatibns eccasmnea 1 in- 4 said second load circuit will not be transmitted to said first named load circuit.

2. The invention as defined in'claim 1 wherein said first electrical storage device consists of a battery.

3. The invention as defined in claim 1 wherein said first electrical storage device consists of a battery and said second electrical energy storage devicevconsists of a condenser.

4. The invention as defined in claim 1 wherein said impedance element consists of an inductive impedance.

5;. Therinvention as defined in claim 1 wherein said means adapted to be energized from the unfiltered power supply comprises a transformer in association with a rectifier included between the transformer: secondary and a battery, said battery constituting said first electrical energy storage device.

JOHN R. GELZER.

REFERENCES CITFJ) The following references are of record in the file of' this patent:

UNITED STATES PATENTS Number. Name Date.

968,896 Thomas Aug. 30, 1910 1,613,949? Heising Jan. 11, 1927 1,807,331 Wright May 26, 1931 1,878,101 Bradbury Sept. 20, 1932 1;930,165 Gage Oct. 10, 1933 2,163,218 Schlesinger. June 20, 1939 2,240,123 Shoup eta] Apr. 29, 1941 

